Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5ca53196d85b48…

MALICIOUS

PDF

70.4 KB Created: 2020-12-31 13:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2d01f52a8ef41d9a21195b3272e16a93 SHA-1: 3edbc181024d6b1e76b71b4ac4fdfea6ddf713cc SHA-256: ac5ca53196d85b48a39bdfd5785176723a59b263b327312d999f94e41ede2c36
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded links, one of which points to known malicious redirector infrastructure (ggtraff.ru), suggesting a phishing or malware distribution attempt. The presence of numerous other PDF links, some pointing to benign files and others to unknown destinations, further supports the idea of a link farm or redirection scheme. The document body is heavily obfuscated and appears to contain metadata related to its generation rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?utm_term=chemistry+colligative+properties+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/zudoputasafe/Ojep9ia/nuvikazisekudemagag.pdfIn PDF document text
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/7713966.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/VpcaIUt/one_of_my_bucket_list_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feseni/dslr_camera_pro_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/43190252635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f661fc4-099e-435a-8c05-d14cd2ca4c5d/xekomola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53090502-0913-463b-8887-571fbddfb085/50454402300.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/popedat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10fa7531-b144-425e-8313-dae5b5f9a446/firisulenofan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98ef94e-2595-4f77-9369-b899c88c49e4/breeding_calculator_dragon_story_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ee5ff7-01e6-4f0a-98c3-7b968b0b4174/spyro_reignited_trilogy_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/1492_conquest_of_paradise_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29fed18-25a6-4c32-a6bf-4e3e293e0b0c/88807730157.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 5572 bytes
SHA-256: f80c0a44e888a994acc2e2617b4a49dbc8e631359a570a262fd3e7a53f35d647
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 11540 bytes
SHA-256: 615fec694246b1d750a47a4408e4281c95fac307fecf494ffceda1ea26aed898

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